An impromptu action is one that you do without planning or organizing it in advance. adj usu ADJ n
This afternoon the Palestinians held an impromptu press conference...
Translation English Cobuild Collins Dictionary
adj ad-lib, extemporaneous, extempore, extemporized, improvised, offhand, off the cuff (informal) spontaneous, unpremeditated, unprepared, unrehearsed, unscripted, unstudied
adv ad lib, off the cuff (informal) off the top of one's head (informal) on the spur of the moment, spontaneously, without preparation
, adj considered, planned, premeditated, prepared, rehearsed
English Collins Dictionary - English synonyms & Thesaurus
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